Pontoniopsides, Bruce, A. J., 2005

Bruce, A. J., 2005, A new genus Pontoniopsides, for Pontoniopsis paulae Gore, 1981 (Crustacea: Decapoda: Pontoniinae), Zootaxa 826, pp. 1-4 : 2-3

Pontoniopsides gen. nov.

Definition. Small sized pontoniine shrimp of robust, subcylindrical, body form. Rostrum very short, acute, unarmed, dorsal carina feebly developed, lateral carinae not broad, not covering bases of eyestalks; carapace glabrous, inferior orbital angle obsolete, antennal spine acute, orbit feebly developed, supraorbital, epigastric and hepatic spines absent, anterolateral angle rounded, not produced. Abdomen with posterior segments depressed, pleura rounded, sixth segment with posterolateral angle small, acute, posteroventral angle well developed, acute. Telson with two pairs of small, marginal dorsal spines, three pairs of posterior spines. Eye normal, with hemispherical cornea. Antennule with acute ventromedial tooth on proximal segment, anterolateral tooth well developed, exceeding half length of intermediate segment, flagella reduced. Antenna with basicerite unarmed, scaphocerite well developed, with distolateral tooth strong, exceeding lamella. Mandible normal, without palp, molar process subcylindrical, incisor process with oblique set of five acute teeth distally, without denticles along medial border. First maxilliped without palp, basal endite large, broad, laterally convex, medially sublinear, feebly distinct from coxal endite, exopod well developed with large caridean lobe, flagellum with plumose terminal setae, epipod large, bilobed. Second maxilliped endopod with dactylar segment normal, basis without medial angulation, exopod flagellum well developed with plumose terminal setae, epipod well developed, elongate, curved, without podobranch. Third maxilliped with ischiomerus distinct from basis, endopod normal, exopod flagellum well developed with plumose terminal setae, coxa with angular medial process, with large rounded lateral plate, with small arthrobranch. First pereiopods short, with simple chelae. Second pereiopods with robust chelae, dissimilar, unequal, palm glabrous, smooth, suboval in section, major chela massive, with fingers without molar process and fossa, dactylus with single small blunt tooth, fixed finger with single small blunt tooth, both sparsely setose, proximal segments unarmed; minor second pereiopod chela half length of major chela, fingers unarmed. Ambulatory pereiopods normal, dactylus compressed, corpus distally laminar, bluntly bidentate, sparsely setose, with unguis distinct, propod with strong club­shaped denticulate distoventral and ventral spines. Uropod with protopodite unarmed, exopod with distolateral tooth and spinule.

Type Species. — Pontoniopsis paulae Gore, 1981 .

Etymology. — From Pontoniopsis , a pontoniine generic name first used by Borradaile (1915), and ­ ides, a suffix (Greek), son of. Gender masculine.

Hosts. — Associated with echinoids.

Systematic Position. — Generally similar to Pontoniopsis Borradaile, 1915 . Differs from that genus in the following characters:

Rostrum ( Fig. 1 G) acuminate, lateral carinae of rostrum ( Fig. 1 F) feebly expanded, peduncles of eyestalks fully exposed dorsally, orbit ( Fig. 1 E) feebly developed, without postorbital notch, with distinct inferior orbital angle and marginal antennal spine, first segment of antennular peduncle without massive ventromedial tooth, first maxilliped without palp, third maxilliped with arthrobranch, first pereiopod with fingers of chela not spatulate, second pereiopods not grossly unequal, major chela massive, minor chela not greatly reduced, major chela with fingers feebly dentate, dactylus without lateral flange, third pereiopod dactyl ( Fig. 1 H) compressed, corpus distally laminar, feebly bidentate, unguis distinct, propod with strong denticulate club­shaped distoventral and ventral spines.

Lemaitre.

Figures

FIGURE 1. Pontoniopsides paulae (Gore, 1981), holotype male. A, carapace, eye and rostrum, lateral. B, anterior carapace, eye and orbital region, dorsal. C, rostrum. D, third pereiopod, distal propod and dactyl. Pontoniopsis comanthi Borradaile, 1915, ovig. female, Heron Island, QM W 27259. E, carapace, eye and rostrum, lateral. F, anterior carapace, eye and orbital region, dorsal. G, third pereiopod distal propod and dactyl. H, same, dactyl, distal corpus and unguis .. A – C, redrawn from Gore, 1981, D, from drawing by Raphael