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Harpacticoida ( Order ) |
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Cervinioidea ( Superfamily ) |
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Aegisthidae ( Family ) |
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Andromastax ( Genus ) |
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Andromastax muricatus Conroy-Dalton & Huys, 1999 (F,M) | |
| | | | | | | Ref.: | | | Conroy-Dalton & Huys, 1999 (p.409, figs.F,M ) |  issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.410, Fig.1]. Female (from Galapagos Rift): A, habitus (dorsal; caudal rami omitted); B, idem (lateral). Surface ornamentation on body omitted in A, B. Scale bar in microns
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.411, Fig.2]. Female: A, rostral area (dorsal); B, prosome (dorsal; showing detailed surface reticulation); C, urosome (dorsal; caudal rami omitted); D, anal somite and proximal part of caudal rami (dorsal). Scale bars in microns
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.413, Fig.3]. Female: A, urosome (ventral; excluding P5-bearing somite) [insets showing position of pore marking original position of seta I (arrowed), and lateral scar indicating seta II]; B, genital field (arrow indicating copulatory pore; inset showing detail of closing apparatus); C, distal part of anal somite and proximal part of caudal rami (ventrall); D, distal part of caudal rami (dorsal); E, idem (ventral). Scale bars in microns.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.409]. Armature of swimming legs P1 to P4 in female and male. Roman numerals = spines; arabic numerals = setae.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.414, Fig.4]. Male: A, habitus (dorsal; surface ornamentation on body omitted); B, rostral area (dorsal); C, urosome (ventral; excluding P5-bearing somite; caudal rami omitted); D, idem (lateral). Scale bars in microns
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.419, Fig.7]. Male: A, A1 (armature omitted); B1, A1: segments 1-7 (ventral); B2, A1: segment 8 and proximal portion of segment 9 (ventral); B3, A1: distal portion of segment 9 (ventral); C, idem (dorsal). Relative position of B1-3 indicated in A by markers black points and stars. Arrow in B3 and C indicating basally fused seta of acrothek on segment 9.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.420, Fig.8]. Male: A, A1; C, P5 (anterior); D, genital and 1st abdominal somites (ventral). Female: B, labrum. Scale bars in microns.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.421, Fig.9]. Female: A, Md; B, Mx1 (anterior); C, P6. Male: D, Md (drawn at same scale as A); E, idem; F, Mx1 (anterior; drawn at same scale as B [inset showing detail of arthrite]. Scale bars in microns.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.422, Fig.10]. Female: exopod of A2; B, Mx2. Male: D, Mx2; E, Mxp. Scale bars in microns.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.423, Fig.11]. Female: P1 (anterior); B, P2 (anterior). Male: C, distal part of P2 exopodite 3 (anterior). Scale bars in microns.
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.427, Fig.14]. Scanning electron micrographs. A, rostral area in male (ventral); D, caudal ramus showing tube pore replacing seta I in female. Scale bars = 50 microns (A); 5 microns (D).
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 issued from : S. Conroy-Dalton & R. Huys in J. Crustacean Biol., 1999, 19 (2). [p.428, Fig.15]. Cephalosome showing atrophied mouthparts in male (ventral). Scale bar = 50 microns.
| | | | | NZ: | 1 | | | | | | | Loc: | | | E Pacif. (Galapagos Rift: 2,494 m; washings of mussel-bed samples) | | | | N: | 1 | | | | Lg.: | | | (917) F: ± 3,37-3,61; M: ± 3,18-3,31; {F: ± 3,37-3,61; ± 3,18-3,31} | | | | Rem.: | epibenthic (depth: 2494 m)
For Conroy-Dalton & Huys (1999, p.425) the species can unequivocally be allocated to the family Aegisthidae (superfamily Cervinioidea) on the basis of a combination of primitive (P1-bearing somite not fused to cephalosome; P1 exop-1 with inner seta) and advanced characters (A1 female 7-segmented with aesthetasc on segment 3; A2 with allobasis and 2-segmented exopod; reduced mandibular palp; Mx1 endopod completely incorporated into basis and coxal epipodite absent; uniramous P5 in both sexes; P6 female produced into elongate and narrow extension; extreme elongation of caudal rami.
However, the inclusion of this species in Aegisthus proved impossible without grossly extending its generic boundaries. The species is regarded as the type of a new genus on account of the followin apomorphies (character derived from and differing from an ancestral condition): 1- pattern of conspicuous dorsal spinous processes on trunk somite; 2- cephalosome with lateral spinous process near bases of A2; 3- lateral process on coxae P2-P4; 4- anterior margin of female A1 segment 2 with lateral process; 5- Mx2 with allobasis and endopod 1 modified coarsely pinnate spines; 6- sexual dimorphism exhibited in distal outer spine of P2-P4 exopod 3, and in segmentation of P1 exopod (2-segmented in female, 3-segmented in male).
Further differentiating characters are: 6- relatively shorter caudal rami in comparison to other aegisthid species (only about 1.15 times length of all body somites combined); 7- sexual dimorphism of P1 inner base sspine, P2-P4 bases, P4 endopod 2, and anal somite.
There is compelling morphological evidence from both sexes that the species is more primitive than its holoplanktonic relatives currently placed in . Plesiomorphic character (ancestral or primitive) states displayed by the female are: 1- mandibular palp 2-segmented and bisetose; 2- Mx1 basis with 8 elements; 3- A2 exopod with 3 elements, formula [1, 2]; 4- endopod of Mxp with 4 setae; 5- P5 exopod with inner seta; 6- P6 with 3 setae. The primitive position is even more obvious from the male. | | | Last update : 03/03/2009 | |
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 Any use of this site for a publication will be mentioned with the following reference :
Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2012. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en
[Accessed May 21, 2013] © copyright 2005-2012 CNRS, UPMC
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