Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Maemonstrilla ( Genus )
Maemonstrilla turgida  (A. Scott, 1909)   (F)
Syn.: Monstrilla turgida A. Scott, 1909 (p.239, Descr.F, figs.F); Martin Thompson & Meiyappan, 1977 (1980) (p.207, figs.F, Rem.); Grygier, 1995 a (p.77); Suarez-Morales & Dias, 2001 (p.226: Rem.)
? Monstrilla sp. Krishnaswamy, 1953 (p.75, figs.)
Ref.:
Grygier & Ohtsuka, 2008 (p.492, figs.F, Rem.: comb. nov.)
Species Maemonstrilla turgida - Plate 1 of morphological figuresissued from : P.K. Martin Thompson & M.M. Meiyappan in Indian J. Fish., 1977 (1980), 24 (1-2). [p.207, Fig.1]. As Monstrilla turgida.
Female (from Minicoy Island, Indian Ocean): a-b, habitus (dorsal and lateral, respectively); c, forehead (dorsal, enlarged); d-e, urosome (dorsal and lateral, respectively; enlarged); f, A1; g, P1; h, P2; i, P3; j, P4; k, P5.

Nota: Ratio of cephalothorx : rest of body 49.21:50.79. Urosome 3-segmented, markedly short, about 1/7 total length. Genital segment sub-quadrangular in shape and transversed at its mid-length by a distinct suture; longer than the combined length of following two segments; a pair of ovigerous spines present on ventral side which is about one-and -half times length of urosome; 3rd urosomal segment broader distally. Caudal rami longer than broad (ratio 58.82:41.18, each with 1 outer marginal seta and 5 sub-equal apical setae. Mouth placed near anterior region of cephalosome. Eyes well developed. Proportional lengths of various segments of body (caudal rami included) 49.21; 9.95; 12.05; 7.85; 6.28; 5.24; 2.09; 2.62; 4.71 = 100. A1 4-segmented, attains about 1/3 length of cephalosome, last segment longest, but shorter than combined length of first three segments; proportional lengths 23.66; 17.74; 16.67; 41.93 = 100.


Species Maemonstrilla turgida - Plate 2 of morphological figuresissued from : P.K. Martin Thompson & M.M. Meiyappan in Indian J. Fish., 1977 (1980), 24 (1-2). [p.208]. As Monstrilla turgida.
Female: Setae and spines on three segments of exopodite (Re) and endopodite (Ri).


Species Maemonstrilla turgida - Plate 3 of morphological figuresissued from : P.K. Martin Thompson & M.M. Meiyappan in Indian J. Fish., 1977 (1980), 24 (1-2). [p.209]. As Monstrilla turgida
Characters comparison between specimens fro Pacific Ocean and Minicoy Island.


Species Maemonstrilla turgida - Plate 4 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.494, Fig.24].
Female (from Sesoko Island): A, habitus (ventral); B, left A1 (ventral; setules omitted; setal designations after Grygier & Ohtsuka, 1995, fig.6); C, urosome (ventral; ovigerous spines and most setae cut short, some representative setules shown on furcal setae, copulatory pore arrowed).
Scale bars = 0.500 mm in A; 0.0100 mm in B, C.


Species Maemonstrilla turgida - Plate 5 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.462, Fig.1].
Body form of females from Sesoko Island, with explanation of segmental terminology and measurements taken. [in dorsal view see Maemonstrilla polka].
Abbreviations: cr, caudal ramus; cw, cephalothrax width; fp1-4, free pedigers 1-4 (i.e. thoracomeres 3-6); gcs, genital compound somite; ip, incorporated pediger (i.e. thoracomere 2); ps, penultimate somite; t, telson; w, waist.
Scale bar = 0.500 mm.


Species Maemonstrilla turgida - Plate 6 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.497, Fig.27].
Female: A, P1 (posterior); B, intercoxal sclerite of P1 (anterior); C, right P2 (anterior); D, left P3 (posterior); E, outer apical exopodal seta of left P3; F, right P4 (anterior); G, right P5 (medial view); H, compound genital somite (lateral, anterior to left) showing prominence at anterior base of ovigerous spines (latter cut short).
In A, C, D, F and G, setules omitted, some setae cut short.
Scale bars = 0.200 mm (A-D, F); 0.100 mm in E, G, H.


Species Maemonstrilla turgida - Plate 7 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.495, Fig.25]. SEM.
Female: A, cephalothorax (lateral); B, oral papilla (o), scars, pores (arrows) and base of A1 (a); C, striations of cephalothorax and 2 left-hand pores (arrows) behind oral papilla; D, ovigerous spines with attached eggs overlying two intercoxal sclerites; E, protopod of P4 (lateral), showing pathches of denticles, arrows bounding region enlarged in F; F, detail of E; G, detail of outer apical exopodal seta of P2.
Scale bars = 0.200 mm (B, D, E); 0.005 mm in C; 0.010 mm (F, G).


Species Maemonstrilla turgida - Plate 8 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.496, Fig.26]. SEM.
Female: A, dorsal spinulation and pores (arrows) of 1st free pediger (anterior at top); B, spiniform scales and pit setae at centre rear of dorsum of free pediger 1 (posterior at bottom); C, pore, spiniform scales, and pit setae at centre rear of dorsum of free pediger 2 (posterior at bottom left); D, right dorsal spinulation, pore and pit setae of free pediger 3 (anterior at right); E, spinulation of genital compound somite (g, letter placed on this segment's dorsal suture and penultimate segment of urosome (dorsolateral), anterior at right.
Scale bars = 0.010 mm.


Species Maemonstrilla turgida - Plate 9 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.499, Fig.29].
Female: Dorsal and lateral pore and pit seta patterns, from rear of cephalothorax through genital compound somite.
Symbols: dots (three sizes) = pores; larger circles = pits of pit setae; arrowheads = spiniform scales.
Pattern based on SEM and light microscopical examination.


Species Maemonstrilla turgida - Plate 10 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.498, Fig.28].
Female (Syntype, 'Siboga' Expedition, Sta. 142): A, habitus (lateral); B, right A1 (ventral view; setal designation after Grygier & Ohtsuka, 1995, fig.6), dotted 4v3-seta missing, but drawn in based on its presence in left antennule; C, right P2 (endopod); D, loose, broken-off exopod of P2, 3 or 4; E, rami of left P3 (above) and P4 (below (anterior view); F, basis and rami of right P3 (anterior view); G, rami of right P4 (anterior view); H, P5 and genital compound somite (lateral)I, telson and caudal rami (lateral).
Scale bars = 0.500 mm (A); 0.100 mm (B); 0.200 mm in C-I.


Species Maemonstrilla turgida - Plate 11 of morphological figuresissued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.477, Fig.13, B].
B, ovigerous female (neotype from Sesoko Island).
photomicrographs of preserved specimen.
Scale bar = 0.500 mm.
Nota For the authors the unusual direction of the ovigerous spines suggests that species of Maemonstrilla practise subthoracic brooding. Although it is conceivable that the spines point forward only after the final moult and bend backwards to the 'normal' position when the eggs are deposited, several exemples refute this. A few eggs (about 0.023 mm in diameter) were found attached to the anteriorly pointing spines of two specimens (see fig.25D), and there were two large clusters (part of a single larger original mass ?) on the spines of another specimen of this species. A contrario all three specimens of M. polka bore very large egg masses held beneath and matching in length, the cephalothorax and metasome. M/ okame also were carrying eggs beneath the thorax.


Species Maemonstrilla turgida - Plate 12 of morphological figuresIssued from : A. Scott in The Copepoda of the Siboga Expedition Part I. Siboga-Expeditie XXIX a., 1909. [Pl. LVIII, Figs.5-6]. As Monstrilla turgida.
Female (from off Laiwui, coast of Obi Major): 5, habitus (dorsal); 6, P5.

Nota: Cephalic segment greatly inflated just behind the frontal margin. It is slightly longer than the posterior part of the body.
Frontal margin broad and boldly rounded.
Abdomen 3-segmented.
Genital segment sub-quadrangular in shape and traversed near the middle by a distinct suture. It is one and half times longer than the combined length of the next two segments. The segment is nearly as long as the united length of the next two segments and caudal rami.
The 2nd and 3rd segments sub-equal in length.
Caudal rami slightly longer than broad and about one and a half times longer than the anal segment; each ramus with 1 outer marginal seta and 5 apical setae. The apical setae sub-equal in length.
A1 4-segmented and equal to one-third of the length of the cephalic segment.
P5 moderately long and rather slender. The apex bi-lobed; inner lobe narrower than outer lobe and extends beyond the apex of it. It is furnished with 1 seta. The outer lobe with 3 setae.

NZ: 3

Distribution map of Maemonstrilla turgida by geographical zones
Loc:
Indian (Lagoon Minicoy Is.), Indonesia-Malaysia (Ceram Sea, coast of Orbi Major), Souhth China Sea, S Japan (Sesoko Islands, Ishigaki Is.)
N: 3
Lg.:
(5) F: 2; (781) F: 2,42-2,26; (1077) * F: 1,38-2,21; {F: 2,00-2,42} * sum of lengths of cephalothorax, metasome and urosome in lateral view.
Rem.: After Martin Thompson & Meiyappan (1977) the slight variations noted in the specimens described from Minicoy compared to the type material may be due to the geographical variations in the species.
For Grygier & Ohtsuka (2008, p.500) the unidentified Monstrilla figured by Krishnaswamy (1953) from Kundugal Channel (India) seems to be a female of Maemonstrilla turgida or a similar species.
Last update : 27/08/2013
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