Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Monstrilla ( Genus )
Monstrilla humesi  Suarez-Morales, 2001   (F)
Suarez-Morales & Escamilla, 2001 (p.1439, figs.F, Rem.); Suarez-Morales, 2011 (p.9)
Species Monstrilla humesi - Plate 1 of morphological figuresissued from : E. Suarez-Morales & J.B. Escamilla in J. Nat. Hist., 2001, 35. [p.1440, Fig.3].
Female (Laguna de Chelem, Yucatan): A, C, habitus (ventral and dorsal, respectively); B, left A1 (dorsal view); E, left P3 (showing long basipodal outer seta); F, outer apical exopodal seta of P3.
Nota: Cephalothorax representing about 50 % of total body length. Oral papilla not prominet, located medially, about 23 % of ventral marin from anterior end of cephalothorax.Ventral ocelli absent; dorsal ocelli present, rounded in dorsal view, pigment cups relatively large, poorly developed, relatively widely separated from each other by gap equal to diameter of ocellus. 2 sensilla located on forehead between antennular bases, visible in dorsal view. A1 4-segmented (but purported segments 2-4 partially fused), relatively long, representing about 27 % of total body length, and 53 % of cephalothorax length; distal setae unbranched; length ratio antennular segments (from proximal to distal) 17.1:30.8:15.4:36.7 = 100. Head and 1st pedigerous somite fused.

Species Monstrilla humesi - Plate 2 of morphological figuresissued from : E. Suarez-Morales & J.B. Escamilla in J. Nat. Hist., 2001, 35. [p.1441, Fig.4].
Female: A, habitus (lateral); B, forehead (dorsal); C, anal somite with caudal rami (ventral); D, 5th pedigerous somite with P5, and genital double somite with ovigerous spines (ventral); E, idem (lateral).
Nota: P5 bilobed, outer lobe about 2 times as long as inner one, with 3 terminal setae subequal in length, lightly setulated; inner lobe armed with 1 terminal seta. Urosome consisting of 5th pedigerous somite, genital compound wsomite, and 2 free abdominal somites; ratio of lengths of 5th pedigerous somite to anal somite 25.1:50.1:16.6:8.4 = 100. Genital double somite bearing pair of short ovigerous spines, separate at base., thick in proximal 2/3 and slender distally, with scattered cuticular scars on proximal 1/3. Caudal rami about 2 times as long as wide, not divergent, bearing 4 setae.

Species Monstrilla humesi - Plate 3 of morphological figuresissued from : E. Suarez-Morales & J.B. Escamilla in J. Nat. Hist., 2001, 35. [p.1442].
Female: Armament formula of swimming legs.

NZ: 1

Distribution map of Monstrilla humesi by geographical zones
G. of Mexico (Yucatan: Laguna de Chelem)
N: 1
(862) F: 0,75; {F: 0,75}
Rem.: Sampling depth: 0-1.2 m.
This species resembles M. helgolandica and M. gracilicauda, but can be separated from these by the struture of P5.
Last update : 20/01/2015
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2017. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en 
[Accessed January 21, 2018]

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Marine Planktonic Copepods

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