Macrobrachium caementarius (Molina, 1782) Mantelatto & Pileggi & Pantaleão & Magalhães & Villalobos & Álvarez, 2021

Mantelatto, Fernando L., Pileggi, Leonardo G., Pantaleao, Joao A. F., Magalhaes, Celio, Villalobos, Jose Luis & Alvarez, Fernando, 2021, Multigene phylogeny and taxonomic revision of American shrimps of the genus Cryphiops Dana, 1852 (Decapoda, Palaemonidae) implies a proposal for reversal of precedence with Macrobrachium Spence Bate, 1868, ZooKeys 1047, pp. 155-198 : 155

Macrobrachium caementarius (Molina, 1782) comb. nov.

Cancer caementarius Cancer caementarius Molina, 1782: 208.

Palaemon Gaudichaudii H. Milne Edwards, 1837 in H. Milne Edwards 1834-1840: 400.

Cryphiops spinuloso-manus Dana, 1852: 26.

Bithynis longimana Philippi, 1860: 164.

Macrobrachium africanum Spence Bate, 1868: 366, pl. 31, fig. 3.

Cryphiops caementarius . - Holthuis 1952a: 137, pls. 33-35. - Holthuis 1952b: 74, fig. 17. - Holthuis 1955: 52, fig. 28. - Bahamonde 1957: 7. - Hartmann 1957: 117. - Hartmann 1958: 15, figs 1-5. - Bahamonde 1962: 7. - Del Solar et al. 1970: 19 (catalog). - Chirichigno Fonseca 1970: 16 (list), fig. 28. - Boschi 1977: 7. - Manning and Hobbs Jr. 1977: 158 (list). - Retamal 1977: 4 (table), 5, fig. 4. - Viacava et al. 1978: 161. - Holthuis 1980: 81 (list). - Méndez 1981: 14 (list), 73 (list), 75 (key), pl. 33 figs 246, 247. - Retamal 1981: 14 (list), fig. 35. - Rodríguez 1981: 47 (list). - Pérez Farfante 1982: 375. - Pretzmann 1983: 316. - Wicksten and Hendrickx 1992: 7 (list). - Holthuis 1993: 106, fig. 93. - Pereira 1997: 21, fig. 18C, 47, table 6 (list). - Bahamonde et al. 1998: 93. - Kameya et al. 1998: 90 (list). - Meléndez and Maldonado 1999: 125, 130. - Jayachandran 2001: 24. - Retamal and Jara 2002: 195, 204 (list). - Zuñiga Romero 2002: 21, 1 fig. - Wicksten and Hendrickx 2003: 60 (list). - Jara et al. 2006: 42, table I, 43, table II, 46, table IV. - Meruane et al. 2006: 285, fig. 1. - Báez and López 2010: 244. - Retamal and Moyano 2010: 307, table 1. - Pileggi and Mantelatto 2010: 197, table 1. - Ríos-Escalante et al. 2013: 850, table 1. - Rossi and Mantelatto 2013: 3, table 1 (list). - Morales and Meruane 2013: 1441, figs 1, 3-5. - Moscoso 2014: 12 (list), 44. - De Grave et al. 2015a: 5, table 1. - Zacarías Ríos and Yépez Pinillos 2015: 398, fig. 1. - Wasiw G., Yépez P. 2015: 166, fig. 2D. - Mantelatto et al. 2020: 915 (key). - Velásquez et al. 2020: 1062.

Cryphiops spinolosomanus . - Maccagno and Cucchiari 1957: 213.

Cryphiops (Cryphiops) caementarius . - Villalobos Hiriart et al. 1989: 162. - De Grave and Fransen 2011: 316 (catalog), fig. 36. - Ashelby et al. 2012: 295, table 1 (list).

Material examined.

Chile - Coquimbo • 2 males, cl 28.2, cl 36.4 mm; rio Limari , Jul. 2006; C. Gaymer leg.; CCDB 1870 • 2 males, cl 30.3, cl 86.5 mm; Limari, rio Puente ; 19 Oct. 2007; L.G. Pileggi, E.C. Mossolin leg.; CCDB 2146 • 2 males, cl 5.4, cl 5.7 mm, 4 females, cl 5.6 to 10.1 mm, 2 ovigerous females, cl 14.9, cl 16.8 mm, 8 juveniles, cl 3.4 to 4.8 mm; La Serena, Playa el Faro , Avenida de Mar ; 18 Oct. 2007; F.L. Mantelatto, L.G. Pileggi, E.C. Mossolin; CCDB 2327 .

Description.

Rostrum. Straight, short, nearly reaching first article of antennular peduncle; upper margin with 6-8 teeth, regularly spaced, one and/or two behind posterior margin of orbit; lower margin with 0-4 teeth.

Cephalon. Scaphocerite 2 × as long as wide; outer margin convex proximally.

Carapace. Smooth, with strong, acute antennal spine; hepatic spine absent. Lower orbital angle obtuse, moderately pronounced.

Pereiopods . P1 slender, reaching with most of carpus beyond scaphocerite; fingers slightly longer than palm; carpus slightly shorter than chelae; ischium and merus distinctly spinulated; carpus and chelae smooth. P2 strong, with many spines, strong heterochely; largest cheliped reaching with half-length of merus beyond scaphocerite; ischium larger than half-length of merus; merus longer than carpus; carpus short, slightly shorter than half length of palm, with strong basal constriction; propodus 2.1 × as long as dactylus, 3.3 × as long as carpus; palm slightly inflated, more than 2.3 × as long as high; fingers shorter than palm, with numerous small spinules, cutting edges with 4-7 denticles of equal size. P3-P5 smooth, except for sparse setae and spinules along lower margin of propodus; propodus nearly 2 × as long as carpus; propodus slightly shorter than merus; P3 reaching with half-length of dactylus beyond scaphocerite, propodus 2 × as long as dactylus; P4 reaching with tip of dactylus end of scaphocerite, propodus 1.5 × as long as dactylus; P5 reaching with tip of dactylus half-length of scaphocerite, propodus 1.5 × as long as dactylus.

Pleon. Smooth. Somite 5 with posteroventral angle of pleuron acute; somite 6 slightly longer than somite 5. Inter-uropodal sclerite with strong, keel-shaped pre-anal carinae.

Pleopods. PL2 with appendix masculina 2 × as long as appendix interna.

Uropods. Exopodite with mobile spines slightly longer than spiniform projection of outer margin.

Telson. Broad, smooth; 1.5 × as long as abdominal somite 6, bearing 2 pairs of dorsal spinules, first pair located in middle of telson, second pair located ¾ of length of telson. Posterior margin rounded, ending in truncated tip, with several plumose setae and two pairs of posterior spinules, inner pair not reaching end of telson.

Size.

See in material examined.

Color.

Yellowish green with light brown spots dorsally. P2 with reddish joints and greenish blue color.

Type locality.

Chile.

Distribution.

Pacific coastal river basins from Perú and Chile ( Holthuis 1952a, b; Jara et al. 2006; Morales and Meruane 2013).

Life cycle.

Exclusive of coastal waters, dependent of brackish waters to complete its life cycle. The eggs are numerous and small: 0.43-0.62 mm of major diameter ( Norambuena 1977; Yávar and Dupré 2007; Bazán et al. 2009). The larval development is long, with many free-swimming larval stages ( Morales et al. 2006), following the usual pattern of coastal palaemonid species.

Remarks.

For the heterochelia, the robustness and strong shape, as well as the ornamentation of the second pereiopod, M. caementarius comb. nov. is comparable with M. hancocki Holthuis, 1950, and M. occidentale Holthuis, 1950 from the Pacific slope. The species is morphologically similar to M. heterochirus (Wiegmann, 1836) from the Atlantic slope, particularly concerning the shape of the rostrum, carapace, and telson.