Righiodrilus lebrijae , Celis, Liliana V. & Rangel-Ch, Orlando, 2015

Celis, Liliana V. & Rangel-Ch, Orlando, 2015, Two new earthworm species (Oligochaeta: Annelida) of the Caribbean region of Colombia, Zootaxa 3974 (1), pp. 106-114: 111-113

publication ID

http://dx.doi.org/10.11646/zootaxa.3974.1.7

publication LSID

lsid:zoobank.org:pub:6EA64894-DAC1-4C9B-A3A7-D075AF5B87DF

persistent identifier

http://treatment.plazi.org/id/EE301571-FFE5-602C-79C4-FC6DFB7EFB57

treatment provided by

Plazi

scientific name

Righiodrilus lebrijae
status

sp. nov.

Righiodrilus lebrijae  sp. nov.

Figure 3View FIGURE 3, Table 2

Righiodrilus  sp. nov.: Celis & Rangel.-Ch. 2013: 488 f., fig. 268.

Material examined. Holotype: LVCelis007, clitellate specimen; Colombia, Department of Cesar, Aguachica, Barranca Lebrija, Doña María wetland (73 ° 43 ' 49.6 ''W 8 ° 4 ' 47.9 ''N), 50 m asl; L.V. Celis, 13 November 2011. Paratypes: LVCelis006, 42 specimens (27 adults, 15 juveniles); Colombia, Department of Cesar, Aguachica, Barranca Lebrija, Doña María wetland, 45–53 m asl; L.V. Celis, November 2011. LVCelis003, 36 specimens (28 adults, 8 juveniles); Colombia, Cesar, San Martin, Terraplen, El Congo wetland (73 ° 38 ' 42.6 ''W 7 ° 52 ' 48.7 ''N), 58–59 m asl. L.V. Celis, August 2011.

Description. Body cylindrical, without pigment. Body dimensions, holotype: length 65 mm, diameter 1.95 mm in preclitellar region, 3.1 mm at clitellum, 1.9 mm in postclitellar region (segment xl), 133 segments; paratypes: length 60.7–70 mm, diameter 1.8–3.5 mm, 112–135 segments. Setae visible from segment iii; closely paired, 8 per segment, in two ventro-lateral and two latero-dorsal rows. Setae slightly sigmoid without node. Genital setae not found. Distance between setae in mid-body region (segments xl–l) aa: ab: bc: cd: dd = 25: 1.0: 5.0: 1.0: 32.5 (holotype). Clitellum saddle-shaped with barely defined margins in segments xv–xxi; tubercula pubertatis in ½ xvi –½ xix ( Fig. 3View FIGURE 3 A). Male pores in intersegment 17 / 18, female pores in segment xiv. Spermathecal pores visible in 8 / 9 and 9 / 10. Nephridiopores above setae b visible from intersegment iv.

Internal anatomy. Septa 7 / 8–10 / 11 thick and muscularized. Gizzard strongly muscularized, rounded, in segment vi. One pair of extramural, pyriform calciferous glands with tubular structure ( Fig. 3View FIGURE 3 B) emerging from postero-lateral region of esophagus of segment xi and extending to segment xiv; glandular part in segments xi, xii, membranous part in segments xiii, xiv ( Fig. 3View FIGURE 3 C). Transition of esophagus-intestine in segment xiii. Typhlosole simple, from segment xiv, occupying 1 / 3 of gut diameter, folded between segments xiv–xxi, with folds decreasing in number and size from segment xxii to l. Caeca absent. Three pairs of lateral hearts in segments vii, viii and ix, and two pairs of voluminous intestinal hearts in segments x and xi. One pair of holonephridia per segment ( Fig. 3View FIGURE 3 D). Male funnels free in segment xi and connected to deferent ducts. One pair of seminal vesicles from segment xii, extending backwards along the lateral body region to segments xxix, xxx, or xxxi. Male ducts run along the body wall down to 17 / 18. Ovaries in segment xiii. Two pairs of spermathecae in intersegments 8 /9, 9/ 10; anterior spermathcae with long duct and rounded ampulla, posterior spermatheca with oval ampulla ( Fig. 3View FIGURE 3 E).

Etymology. The species is named after the Lebrija River, which flows into several wetlands in southern Cesar, Colombia.

Habitat characteristics. Righiodrilus lebrijae  sp. nov. was collected in three physiognomic types of vegetation (relicts of tropical dry forests and savannas and herbaceous plant formation with trees) in El Congo and Doña Maria wetlands, but not in highly transformed areas ( Celis & Rangel 2013).

Comments. Zicsi (1995 b) separated the genus Righiodrilus  from the genus Glossodrilus Cognetti, 1905  by two major criteria, one being taxonomic (the genus Righiodrilus  has a membranous part in the calciferous gland) and the other one referring to its geographical distribution: species of Righiodrilus  are found in Brazil, Colombia, Ecuador and Venezuela in rainforests below 1000 m asl, whereas species of Glossodrilus  are found above 1000 m in altitude ( Feijoo & Celis 2010). The new species belongs to a group of species of Righiodrilus  with two pairs of spermathecae in intersegments 8 / 9 – 9 / 10. Righiodrilus lebrijae  sp. nov. is close to R. paolettii Righi, 1984 a  , R. arapaco Righi, 1982  , and R. itajo Righi, 1971  , in the position of the clitellum. Within this group, the new species has the same extension of the clitellum as R. paolettii  (xv–xxi), but differs in the extension of the tubercula pubertatis (3 segments vs. 2 ½ in R. paolettii  ), the extension of the seminal vesicles (xxix, xxx, or xxxi vs. xxvi in R. paolettii  ), the position of the male pores (17 / 18 vs. anterior part of segment xvii in R. paolettii  ), the arrangements of setae (closely paired vs. widely paired in R. paolettii  ) and in the shape of the spermathecae (anterior spermathecae with long duct and rounded ampulla, posterior spermatheca with oval ampulla vs. long duct and arrow-shaped ampulla). A comparison of Righiodrilus  species with two pairs of spermathecae is given in Table 2.

TABLE 2. Comparison of species of the genus Righiodrilus with two pairs of spermathecae in segments 8 / 9 – 9 / 10.

Species Length (mm) Clitellum Tubercula pubertatis Posterior extension of seminal vesicles Male pores
R. arapaco Righi, 1982  45–60 ½ xvi–½ xxii (6 segments) ½ xviii–½ xx (2 segments) to segment xiv 19/20
R. itajo Righi, 1971  38–74 xv–xxii (8 segments) ½ xvi–½ xviii (2 segments) to segments l–lviii 16/17
R. mairaro Righi, 1982  60–115 ½ xvi–½ xxii (6 segments) ½ xviii–½ xx–xx (2,2½ segments) to segments xxiv–xxxvi 18/19
R. oliveirae Righi, 1982  180–250 xv–xxiv (10 segments) ⅔xviii–xx (2⅔ segments) to segment xiv ⅔19
R. paolettii Righi, 1984  a 30 xv–xxi (7 segments) xvii–½ xix (2 ½ segments) to segment xxvi 17
R. lebrijae  sp. nov. 60.7–70 xv–xxi (7 segments) ½ xvi–½ xix (3 segments) to segments xxix,xxx–xxxi 17/18

TABLE 2. Comparison of species of the genus Righiodrilus with two pairs of spermathecae in segments 8 / 9 – 9 / 10.

Species Length (mm) Clitellum Tubercula pubertatis Posterior extension of seminal vesicles Male pores
R. arapaco Righi, 1982  45–60 ½ xvi–½ xxii (6 segments) ½ xviii–½ xx (2 segments) to segment xiv 19/20
R. itajo Righi, 1971  38–74 xv–xxii (8 segments) ½ xvi–½ xviii (2 segments) to segments l–lviii 16/17
R. mairaro Righi, 1982  60–115 ½ xvi–½ xxii (6 segments) ½ xviii–½ xx–xx (2,2½ segments) to segments xxiv–xxxvi 18/19
R. oliveirae Righi, 1982  180–250 xv–xxiv (10 segments) ⅔xviii–xx (2⅔ segments) to segment xiv ⅔19
R. paolettii Righi, 1984  a 30 xv–xxi (7 segments) xvii–½ xix (2 ½ segments) to segment xxvi 17
R. lebrijae  sp. nov. 60.7–70 xv–xxi (7 segments) ½ xvi–½ xix (3 segments) to segments xxix,xxx–xxxi 17/18