Parapenaeopsis incisa Wang & Liu

Chan, Tin-Yam, Yang, Chien-Hui, Kumar, Appukttannair Biju & Hurzaid, Amirah, 2025, On the commercial shrimps of the “ Parapenaeopsis cornuta (Kishinouye, 1900) ” species group (Crustacea, Decapoda, Penaeidae), Zoosystematics and Evolution 101 (2), pp. 609-625 : 609-625

publication ID

https://doi.org/10.3897/zse.101.145722

publication LSID

lsid:zoobank.org:pub:370E684B-7400-4D34-AD7B-E63425B02860

DOI

https://doi.org/10.5281/zenodo.15027108

persistent identifier

https://treatment.plazi.org/id/44FAE3E3-38A9-5567-A078-FE8FEB4F012C

treatment provided by

Zoosystematics and Evolution by Pensoft

scientific name

Parapenaeopsis incisa Wang & Liu
status

 

Parapenaeopsis incisa Wang & Liu View in CoL in Liu & Wang, 1987

Figs 1 d View Figure 1 , 2 d View Figure 2 , 3 d View Figure 3 , 4 d View Figure 4 , 5 d View Figure 5

Parapenaeopsis incisa Liu and Wang 1986: 214 (nomen nudum); 1987: 525, fig. 3. (type locality: Wailuo, Guangdong, China); Liu and Zhong 1988: 210, fig. 130. View in CoL

Kishinouyepenaeopsis incisa View in CoL – De Grave and Fransen 2011: 216.

Material examined.

Southern China • [ MBM 155054 View Materials ]: Guangdong, Zhanjiang, Naozhou Island , 29 Jul. 1976, 1 ♀, cl 14.6 mm [ MBM 155041 View Materials ]: Hainan, Yinngehai , 55 - K 444, 7 Dec. 1955, 3 ♂♂, cl 14.5–14.8 mm, 3 ♀♀, cl 16.3–18.2 mm [ MBM 155057 View Materials ]: Hainan, Yinngehai , 57 - K 275, 26 Jun. 1957, 2 ♂♂, cl 12.9–14.4 mm, 2 ♀♀, cl 16.5–17.6 mm [ MBM 155044 View Materials ]: Hainan, Sanya, fish market , 90 C- 324, 25 Nov. 1990, 3 ♂♂, cl 13.2–14.9 mm, 3 ♀♀, cl 14.9–17.6 mm .

Diagnosis.

Rostrum more or less horizontal, straight, and with tip recurved upwards, bearing 6–8 (avg. 7.0, n = 14, excluding epigastric tooth) teeth along dorsal border except near tip, extending to distal antennular segment or just overreaching antennular peduncle. Postrostral carina with posterior 1 / 4 broadened and obscure, sometimes with weak median pit, extending posteriorly to 0.77–0.89 (avg. 0.84, n = 17) of carapace length. Longitudinal suture short, extending posteriorly to about level of epigastric tooth. Pereiopods I and II with basial spines and epipods, pereiopod III without basial spine. Abdominal somites I and II with dorsal carina absent. Telson lacking movable lateral spinules. Males with endopod of pleopod II strongly modified and boot-like; medial part of distal margin protruded and convex, but concealed by tuft of dense long stiff setae arising from anterodistal part of endopod; petasma horn-like with distolateral projections strongly elongated, tip of horn more or less bifurcated and without lateral protuberances on both sides. Female thelycum with anterior plate elongated rectangular and lateral margins more or less concave, 0.99–1.17 (avg. 1.09, n = 9) as long as wide, surface slightly sunken; posterior plate with median part completely flattened, lateral parts semicircular; tuft of setae behind posterior plate long and thick.

Coloration.

Not known, but likely similar to P. cornuta and P. amicus . The photograph of a fresh specimen from the Strait of Malacca, Malaysia, probably belongs to P. incisa ( Fakhruddin et al. 2024: fig. 1; see Discussion); it has a color pattern very similar to P. cornuta and P. amicus , except with the body having more yellowish and greenish taints.

Distribution.

Known with certainty from around Hainan Island in the South China Sea, intertidal to about 30 m deep ( Liu and Wang 1987; Liu and Zhong 1988). Probably also distributed to the Strait of Malacca off Malaysia and Bangladesh ( Fakhruddin et al. 2024; see Discussion).

Remarks.

Parapenaeopsis incisa closely resembles P. cornuta and mainly differs in the shape of the genitalia. In males, the boot-like endopod of pleopod II has the median part of the distal margin protruded in P. incisa (Fig. 4 d View Figure 4 ) but is straight or concave in P. cornuta (Fig. 4 a View Figure 4 ). The tip of the horn-like petasma lacks a lateral protrusion in P. incisa (Fig. 3 d View Figure 3 ) but is distinctly protruded on the outer side in P. cornuta (Fig. 3 a View Figure 3 ). The thelycum of P. incisa has the anterior plate more or less rectangular and relatively long (0.99–1.17, avg. 1.09 as long as wide), while the median part of the posterior plate is completely flattened without any sign of elevation (Fig. 5 d View Figure 5 ). In P. cornuta , the thelycum has the anterior plate semi-quadrate and relatively short (0.74–0.95, avg. 0.85 as long as wide), and the posterior plate bears a weak median ovate boss (Fig. 5 a View Figure 5 ). These unique shapes of the genitalia are also useful in separating P. incisa from the other two species of the “ P. cornuta ” group (Table 2 View Table 2 , Figs 3 View Figure 3 – 5 View Figure 5 ). Similar to the situation in P. amicus , other differences previously proposed to separate P. incisa from the other species of the “ P. cornuta ” group ( Liu and Wang 1987; Liu and Zhong 1988) actually have many overlaps.

Although morphologically P. incisa is most similar to P. cornuta , the high genetic differences (COI sequence divergence 15.0–17.5 %, Table 1 View Table 1 ) of P. incisa from the other species of the “ P. cornuta ” group well support its specific status. As P. incisa can only be satisfactorily distinguished from the other species of the “ P. cornuta ” group mainly by subtle differences in genitalia (Table 2 View Table 2 ), careful examination of the material reported as “ P. cornuta ” from various localities is necessary to determine the exact distribution of P. incisa .

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Penaeidae

Genus

Parapenaeopsis

Loc

Parapenaeopsis incisa Wang & Liu

Chan, Tin-Yam, Yang, Chien-Hui, Kumar, Appukttannair Biju & Hurzaid, Amirah 2025
2025
Loc

Kishinouyepenaeopsis incisa

De Grave S & Fransen CHJM 2011: 216
2011
Loc

Parapenaeopsis incisa

Liu R & Zhong Z 1988: 210
Liu R & Wang Y 1986: 214
1986