Limits...
Evolutionary Relationships and Biogeography of the Ant-Epiphytic Genus Squamellaria (Rubiaceae: Psychotrieae) and Their Taxonomic Implications.

Chomicki G, Renner SS - PLoS ONE (2016)

Bottom Line: Our field and phylogenetic work results in a new circumscription of the genus Squamellaria, which now contains 12 species (to which we also provide a taxonomic key), not 3 as in the last revision.Some of these ant-housing epiphytes must have dispersed with their specialized ants, for instance attached to floating timber.Others acquired new ant symbionts on different islands.

View Article: PubMed Central - PubMed

Affiliation: Systematic Botany and Mycology, University of Munich (LMU), Menzinger Str. 67, 80638, Munich, Germany.

ABSTRACT
Ecological research on ant/plant symbioses in Fiji, combined with molecular phylogenetics, has brought to light four new species of Squamellaria in the subtribe Hydnophytinae of the Rubiaceae tribe Psychotrieae and revealed that four other species, previously in Hydnophytum, need to be transferred to Squamellaria. The diagnoses of the new species are based on morphological and DNA traits, with further insights from microCT scanning of flowers and leaf δ(13)C ratios (associated with Crassulacean acid metabolism). Our field and phylogenetic work results in a new circumscription of the genus Squamellaria, which now contains 12 species (to which we also provide a taxonomic key), not 3 as in the last revision. A clock-dated phylogeny and a model-testing biogeographic framework were used to infer the broader geographic history of rubiaceous ant plants in the Pacific, specifically the successive expansion of Squamellaria to Vanuatu, the Solomon Islands, and Fiji. The colonization of Vanuatu may have occurred from Fiji, when these islands were still in the same insular arc, while the colonization of the Solomon islands may have occurred after the separation of this island from the Fiji/Vanuatu arc. Some of these ant-housing epiphytes must have dispersed with their specialized ants, for instance attached to floating timber. Others acquired new ant symbionts on different islands.

Show MeSH

Related in: MedlinePlus

Squamellaria grayi Chomicki & Wistuba, spec. nov.(A) Habit showing the domatium. (B) Male flower. (C) Bud with reduplicate petal margins. (D) Fruit. (E) Male flower in longitudinal section. (F) Female flower. (G) Flowering shoot with anisophyllous paired leaves.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4814088&req=5

pone.0151317.g004: Squamellaria grayi Chomicki & Wistuba, spec. nov.(A) Habit showing the domatium. (B) Male flower. (C) Bud with reduplicate petal margins. (D) Fruit. (E) Male flower in longitudinal section. (F) Female flower. (G) Flowering shoot with anisophyllous paired leaves.

Mentions: Squamellaria grayi Chomicki & Wistuba spec. nov. [urn:lsid:ipni.org:names:77153474–1] (Figs 2F, 3A–3D, 4 and 5).


Evolutionary Relationships and Biogeography of the Ant-Epiphytic Genus Squamellaria (Rubiaceae: Psychotrieae) and Their Taxonomic Implications.

Chomicki G, Renner SS - PLoS ONE (2016)

Squamellaria grayi Chomicki & Wistuba, spec. nov.(A) Habit showing the domatium. (B) Male flower. (C) Bud with reduplicate petal margins. (D) Fruit. (E) Male flower in longitudinal section. (F) Female flower. (G) Flowering shoot with anisophyllous paired leaves.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4814088&req=5

pone.0151317.g004: Squamellaria grayi Chomicki & Wistuba, spec. nov.(A) Habit showing the domatium. (B) Male flower. (C) Bud with reduplicate petal margins. (D) Fruit. (E) Male flower in longitudinal section. (F) Female flower. (G) Flowering shoot with anisophyllous paired leaves.
Mentions: Squamellaria grayi Chomicki & Wistuba spec. nov. [urn:lsid:ipni.org:names:77153474–1] (Figs 2F, 3A–3D, 4 and 5).

Bottom Line: Our field and phylogenetic work results in a new circumscription of the genus Squamellaria, which now contains 12 species (to which we also provide a taxonomic key), not 3 as in the last revision.Some of these ant-housing epiphytes must have dispersed with their specialized ants, for instance attached to floating timber.Others acquired new ant symbionts on different islands.

View Article: PubMed Central - PubMed

Affiliation: Systematic Botany and Mycology, University of Munich (LMU), Menzinger Str. 67, 80638, Munich, Germany.

ABSTRACT
Ecological research on ant/plant symbioses in Fiji, combined with molecular phylogenetics, has brought to light four new species of Squamellaria in the subtribe Hydnophytinae of the Rubiaceae tribe Psychotrieae and revealed that four other species, previously in Hydnophytum, need to be transferred to Squamellaria. The diagnoses of the new species are based on morphological and DNA traits, with further insights from microCT scanning of flowers and leaf δ(13)C ratios (associated with Crassulacean acid metabolism). Our field and phylogenetic work results in a new circumscription of the genus Squamellaria, which now contains 12 species (to which we also provide a taxonomic key), not 3 as in the last revision. A clock-dated phylogeny and a model-testing biogeographic framework were used to infer the broader geographic history of rubiaceous ant plants in the Pacific, specifically the successive expansion of Squamellaria to Vanuatu, the Solomon Islands, and Fiji. The colonization of Vanuatu may have occurred from Fiji, when these islands were still in the same insular arc, while the colonization of the Solomon islands may have occurred after the separation of this island from the Fiji/Vanuatu arc. Some of these ant-housing epiphytes must have dispersed with their specialized ants, for instance attached to floating timber. Others acquired new ant symbionts on different islands.

Show MeSH
Related in: MedlinePlus