Pseudolongiflagrum, Drumm & Heard, 2022
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publication ID |
https://doi.org/ 10.11646/zootaxa.5116.2.2 |
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publication LSID |
lsid:zoobank.org:pub:F66FE8C9-B813-41CF-ABB1-B9646EC1CB05 |
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DOI |
https://doi.org/10.5281/zenodo.6369014 |
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persistent identifier |
https://treatment.plazi.org/id/03939E49-FFE6-FFC0-FF7A-FBE6943FFAD0 |
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treatment provided by |
Plazi |
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scientific name |
Pseudolongiflagrum |
| status |
gen. nov. |
Pseudolongiflagrum View in CoL n. gen.
Synonyms. Apseudes: Boesch (1973) (in part); Longiflagrum: Guţu (1995) (in part)
Diagnosis. Rostrum well-developed, acute. Hyposphenia strongly developed. Antenna with peduncle article-1 without antero-medial tooth-like projection. Labial palp with three distal spiniform setae. Mandibular palp article-1 with mixture of plumose and simple setae. Cheliped basis with mid-ventral margin having spiniform seta. Pereopod-1 having propodus with two and five, well-developed spiniform setae on dorsodistal and ventral margins, respectively; dactylus well-developed, length greater than propodal width. Pleonite-1 anteriorly having mediallyinterrupted, transverse small setulate setae; pleonites 2–5 lacking transverse row of setae. Pleopodal rami only marginally foliaceous, not broadly expanded distally.
Etymology. Pseudo = false + generic name Longiflagrum. The gender is neuter.
Diagnostic description (extracted from description and illustrations of Boesch 1973).
Rostrum ( Fig. 1A, D View FIGURE 1 ) well-developed, about one third length of post-ocular carapace; lateral margins slightly convex, attenuated anteriorly forming narrow acute tip.
Pereonal hyposphenia on male strongly developed mid-ventrally on pereonites 1–6 ( Fig. 1C View FIGURE 1 ); on incubatory female reduced or absent on pereonites 3–5; on pereonites 1 and 6 similar to male ( Fig. 1F View FIGURE 1 ).
Pleon having pleonite-1 with incomplete transverse, anterodorsal row of short setulate setae, interrupted middorsally ( Fig. 1B, E View FIGURE 1 ); pleonites 2–5 lacking anterodorsal row of setae.
Pleotelson with lateral margins with few small setae, posterior margin forming rounded lobe not extending past uropodal peduncles; male with length about equal to width and length about equal to combined lengths of last three pleonites; female having width slightly more than length and length about equal to combined lengths of pleonites 2 to 5.
Antennule ( Fig. 1G View FIGURE 1 ) with rami subequal, outer ramus slightly shorter.
Antenna ( Fig. 1H View FIGURE 1 ) with peduncle article-1 without antero-medial tooth-like projection.
Mandible ( Fig. 1I View FIGURE 1 ): palp article 1 with inner margin bearing cluster of plumose setae, articles 2 and 3 with long simple setae and short pectinate setae; article-2 shorter than article 3.
Labial palp with three distal spiniform setae.
Maxilliped ( Fig. 1J View FIGURE 1 ) with basis having distolateral subacute process; palp article-1 short, much wider than long, about ¼ length of article-2, outer margin forming narrow lobe with two distal setae.
Cheliped sexually dimorphic, male cheliped ( Fig. 1K View FIGURE 1 ) much larger and more massive than that of female ( Fig. 1L View FIGURE 1 ), generally similar to males and females of Ctenapseudes and Longiflagrum; basis in both sexes having stout spiniform seta on mid-ventral margin; exopod with penultimate article asetose.
Pereopod-1 sexually dimorphic; male ( Fig. 1M View FIGURE 1 ) narrower and less robust than in female ( Fig. 1N View FIGURE 1 ); basis with ventral distal margin having distinct spiniform seta and two to four simple setae; merus having dorsodistal margin with small lobe bearing long, strongly developed spiniform seta and having ventral distal margin with short, stout spiniform seta; carpus with dorsodistal margin expanded dorsodistally forming shallow lobe extending slightly over base of propodus and armed distally with long strongly-developed spiniform seta, ventral margin bearing two short stout spiniform setae; propodus longer than broad, having dorsodistal margin with two spiniform setae adjacent to dactylus, ventral margin with four or five elongate spiniform setae (anterior most adjacent to dactylus); dactylus well-developed, longer than propodal width and shorter than length; ventral margin with three minuscule, buttressed, spiniform setae, tip terminating in small nail: female pereopod-1 ( Fig. 1N View FIGURE 1 ): with articles having same pattern of spiniform setae as in male; except for dactylus, broader; merus and carpus with dorsodistal margin each bearing relatively stout and short spiniform seta and not forming distinct lobe; propodus short, broader than long, with distal margin rounded; dactylus development and morphology as in male, but relatively longer than propodal length and shorter than its width.
Pereopod-4 ( Fig. 1O View FIGURE 1 ) with dactylus distinct, but smaller than those of pereopods 2,3, and 5. Pereopod-6 ( Fig. 1P View FIGURE 1 ): (in posterior orientation) with basis having sparce row of five or six plumose setae along ventral mid-margin; entire dorsal margin having row of numerous setulate or plumose setae.
Pleopods ( Fig. 1Q View FIGURE 1 ): five well-developed pairs, basal article, and rami with numerous plumose setae; marginally foliaceous, rami elongate, sub-rectilinear, not distally expanded or broadly rounded, as in Longiflagrum estuarius ( Boesch, 1973).
Type species. Pseudolongiflagrum caeruleus ( Boesch, 1973) View in CoL n. comb.
Synonyms. Apseudes caeruleus Boesch, 1973 View in CoL ; Longiflagrum caeruleus: Guţu (1995) View in CoL .
Remarks. Pseudolongiflagrum n. gen. is distinguished from the somewhat similar and apparently related Ctenapseudes Bamber, Ariyananda & Silva, 1997, Longiflagrum Gutu 1995, and the new monotypic Mexican genus designated here, by a combination of characters ( Table 2 View TABLE 2 ), which includes (1) well-developed pereonal hyposphenia (absent or poorly developed in the other three genera), (2) the mandibular palp with plumose setae on article-1 (simple setae in the other three genera), (3) the mandibular palp article-3 longer than article-2 (article-3 shorter than article- 2 in the other three genera), (4) the cheliped basis having a distinct spiniform setae on the mid-ventral margin (not present in the other three genera); and (5) the pereopod-1 with a distinctive, well-developed dactylus (reduced in Ctenapseudes and Longiflagrum). For further differences and comparisons refer to Remarks under diagnosis of the new Mexican genus below, and the key to distinguish the genera of the subfamily Parapseudinae .
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.