Haplostoma simplex, Kim & Boxshall, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.4978.1.1 |
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publication LSID |
lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93 |
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DOI |
https://doi.org/10.5281/zenodo.10530929 |
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persistent identifier |
https://treatment.plazi.org/id/3729879B-FF46-FF52-FA93-F9F8D5741BA5 |
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treatment provided by |
Plazi |
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scientific name |
Haplostoma simplex |
| status |
sp. nov. |
Haplostoma simplex sp. nov.
( Figs. 107 View FIG , 108 View FIG )
Type material. Holotype ♀ (intact, MNHN-IU-2014-21521) from Cẚtçrclẚnum labçuteẚ Monniot F. & Millar, 1988; New Caledonia, UA281 , depth 33 m, August 1986.
Etymology. The name is derived from the Latin sẚmpl (=simple), referring to the simplified armature of legs and the loss oral appendages.
Description of female. Body ( Fig. 107 View FIG A-C) maggot-shaped, slightly dorsoventrally depressed; body length 1.18 mm, maximum width 427 μm (across second metasomite). Cephalosome ( Fig. 107D View FIG ) indistinctly defined from metasome, narrower than metasome; 4 metasomites defined by weak constrictions. Last metasomite bearing 3 broad lobes along posterodorsal margin. Genitoabdomen ( Fig. 107E View FIG ) small, unsegmented, occupying only about 8% of body length, obscurely defined from metasome; genital apertures not seen, probably concealed by posterodorsal lobes of last metasomite. Caudal rami ( Fig. 107F View FIG ) small, 1.23 times longer than wide (27×22 μm), rounded distally, originating on ventral surface of genitoabdomen; armed with 2 small setae (1 outer and 1 distal).
Rostrum ( Fig. 107D View FIG ) small, wider than long, with convex posterior margin. Antennule ( Fig. 107G View FIG ) unsegmented, with partial suture line subdistally, armed with 8 small, blunt setae. Antenna ( Fig. 107H View FIG ) 2-segmented; proximal segment plate-like, broad, short, and unarmed; distal segment with 2 spines (trifurcate distal and bifurcate subdistal), 1 rudimentary seta at distal third, and 1 row of minute spinules near middle.
Labrum ( Fig. 107D, I View FIG ) small, slit-like, unornamented. Mandible, maxillule, and maxilla absent. Maxilliped ( Fig. 108A View FIG ) consisting of 4 segments plus terminal claw; all segments unarmed and unornamented; first segment platelike, much broader than other segments; terminal claw short, curved.
Leg 1 ( Fig. 108B View FIG ) consisting of protopod and exopod. Protopod lacking outer seta. Exopod tapering, not articulated from protopod, armed with 1 small seta on outer margin and 1 spine distally; distal spine ( Fig. 108C View FIG ) bifurcate, with ventral and dorsal branches, bearing 1 small setule in middle of outer surface. Endopod not defined. Legs 2-4 same as leg 1 in form and armature. Legs 5 and 6 not seen.
Male. Unknown.
Remarks. eaplçstçma sẚmplex sp. nov. may readily be distinguished from its congeners by the armature of legs 1-4. All of the legs are identical: each has 1 outer seta and 1 distal, bifurcate spine on the exopod. Across all species of eaplçstçma this is the smallest known number of armature elements on the legs; for example, all other species are known to have at least 4 armature elements on the exopod of leg 1. The distal spine of the exopod of each leg is specialized; it is bifurcate with dorsal and ventral branches (not inner and outer branches as is typical) and it bears a setule on its outer surface.
eaplçstçma sẚmplex sp. nov. exhibits several other unusual features, including the lack of the mandible and leg 5, the possession of small caudal rami bearing only 2 simple setae, and the presence of 2 spines and 1 rudimentary seta on the antenna.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.