Duplominona macrocirrus Curini-Galletti, 2019

Curini-Galletti, Marco, Stocchino, Giacinta A. & Norenburg, Jon L., 2019, New species of Duplominona Karling, 1966 and Pseudominona Karling, 1978 (Platyhelminthes: Proseriata) from the Caribbean, Zootaxa 4657 (1), pp. 127-147 : 137

Duplominona macrocirrus Curini-Galletti n. sp.

( Fig. 6 A–C, F, H)

Holotype. Puerto Rico: Harbour of La Parguera (Lat. 17.973256, Lon. -67.046770),lower intertidal in very silty coarse sand, December 1988, original film and printed pictures of the copulatory structures (SMNH-Type 9181).

Other material. Same data as holotype, two specimens observed alive, and used for karyology.

Etymology. The name refers to the very large cirrus of the species (from greek macròs: large).

Description and Diagnosis. Similar to Duplominona dissimilispina , in habitus and arrangement of internal organs ( Fig. 6 A ). Cirrus with a spiny area about 110 μm long, provided with 22–25 rows of spines ( Fig. 6 B, C ). Spines change in morphology and size gradually along the length of the cirrus. Proximal spines and distal spines similar, 3–5 μm long, with a curved tip. Medially, spines are straighter, more acutely triangular, and distinctly longer to 8–9 μm. Prostatoid stylet 17–18 μm long ( Fig. 6H ).

Karyotype. With n=3, and basic karyotype ( Curini-Galletti & Martens, 1990). Chromosome pairs I and II only slightly differing in length ( Fig. 6 F ). Karyotype formula: FN=5; Chromosome I: 42.67 ± 2.97; 47.96 ± 1.26 (m); Chromosome II: 39.18 ± 2.93; 44.28 ± 2.33 (m); Chromosome III: 18.14 ± 1.49; 8.7 ± 2.42 (a) (based on 9 plates).

Figures

FIGURE 6. (A–C, F, H) Duplominona macrocirrus n. sp. (A) Habitus of a living animal; see Fig. 1 for interpretation of anatomical features. (B, C) Reconstruction (B) and micrograph (C) of the inverted cirrus of the Holotype. (F) Micrograph of a metaphasic plate. (H) Micrograph of the stylet of the accessory organ of the Holotype. (D, E, G, I, J) Duplominona puertoricana n. sp. (E) Habitus of a living animal; see Fig. 1 for interpretation of anatomical features. (D, I) Reconstruction (I) and micrographs (G) of inverted cirri (D: Paratype; J: Holotype) (G) Micrograph of a metaphasic plate. (Scale bars: A, B, H–J = 10 m; D = 25 m; F, G = 5 m).